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VIPER17HD-VIPER17HDTR-VIPER17LD-VIPER17LDTR-VIPER17LN
VIPer Plus family: fixed frequancy high performance off line high voltage converter
May 2014 DocID14419 Rev 10 1/33
VIPER17Energy saving VIPerPlus: HV switching regulator for flyback
converter
Datasheet - production data
Features 800 V avalanche rugged power section PWM operation with frequency jittering for low
EMI Operating frequency: 60 kHz for L type 115 kHz for H type Standby power < 30 mW at 265 Vac Limiting current with adjustable set point Adjustable and accurate overvoltage
protection On-board soft-start Safe auto-restart after a fault condition Hysteresis thermal shutdown
Applications Adapters for PDA, camcorders, shavers,
cellular phones, videogames Auxiliary power supply for LCD/PDP TV,
monitors, audio systems, computer, industrial
systems, LED driver, No el-cap LED driver SMPS for set-top boxes, DVD players and
recorders, white goods
DescriptionThe device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of overcurrent protection, overvoltage and
overload protections, hysteresis thermal
protection, soft-start and safe auto-restart after
any fault condition removal. The burst mode
operation and the device’s very low consumption
meet the standby energy saving regulations.
Advance frequency jittering reduces EMI filter
cost. Brown-out function protects the switch mode
power supply when the rectified input voltage
level is below the normal minimum level specified
for the system. The high voltage start-up circuit is
embedded in the device.
Table 1. Device summary
Contents VIPER172/33 DocID14419 Rev 10
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Operation descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.3 Power-up and soft-start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.4 Power down operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.5 Auto restart operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.6 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.7 Current mode conversion with adjustable current limit set point . . . . . . . 19
7.8 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.9 About CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.10 Feed-back and overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . 22
7.11 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 24
7.12 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.13 2nd level overcurrent protection and hiccup mode . . . . . . . . . . . . . . . . . . 27
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
DocID14419 Rev 10 3/33
VIPER17 Block diagram
1 Block diagram
2 Typical power
Figure 2. Block diagram
Table 2. Typical power Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient. Maximum practical continuous power in an open frame design at 50 °C ambient, with adequate heat sinking.
Pin settings VIPER17 DocID14419 Rev 10
3 Pin settings
Figure 3. Connection diagram (top view)
Note: The copper area for heat dissipation has to be designed under the DRAIN pins.
Table 3. Pin description
DocID14419 Rev 10 5/33
VIPER17 Pin settings
Table 3. Pin description (continued)
